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SMALL
package 생활코딩;
interface Calculable{
double PI = 3.14;
int sum(int v1, int v2);
}
interface Printable{
void print();
}
class RealCal implements Calculable, Printable{
public int sum(int v1, int v2) {
return v1 + v2;
}
public void print(){
System.out.println("This is RealCar");
}
}
public class InterfaceApp {
public static void main(String[] args) {
RealCal c = new RealCal();
c.print(); // This is RealCar
System.out.println(c.sum(1,2)); // 3
System.out.println(c.PI); // 3.14
}
}
인터페이스는 약속, 규정임
interface Calculable{
int sum(int v1, int v2);
}
했기 때문에 다른 클래스들은
class RealCar implments Calculable{
public int sum(int v1, int v2) {
return v1+v2;
}
}
public class InterfaceApp {
public static void main(String[] args) {
RealCal c = new RealCal();
c.print(); // This is RealCar
System.out.println(c.sum(1,2)); // 3
System.out.println(c.PI); // 3.14
}
}
RealCar c = new RealCal();
Calculable c = new ReaclCarl(); -> sum과 PI만 작동, print는 X
Printable c = new ReaclCarl(); -> sum과 PI X, c.print만 작동
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